When a substance or large molecule is enclosed by a membrane in a vesicle within the cell, the membrane of the vesicle fuses with the cell membrane and releases the substance out into the cell's surroundings. This is: A exocytosis B endocytosis C facilitated diffusion D osmosis

A

Explanation:

The correct answer would be exocytosis.

Exocytosis is a form of active transport in living cells involving the movement of materials from the inner part of the cell to the outside of the cell. The process is said to be active because it involves the expedition of energy in the form of ATP.

During exocytosis, vesicles housing molecules from the inner part of the cell are transported to and fuse with the cell membrane. The vesicles then expel their contents to the outer part of the cell.

Correct option: A

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explanation:

answer; polycythemia is the correct answer;